Pneumatic rammer.



No. 647,4I6. Patented Apr. I0, |900. J. KELLER.

PNEUMAATIG HAMMER. (Application lod Dec. 21,' 1899.) (No Model.)

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NITED STATES PATENT OFFICE.

JULIU S KELLER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE KELLER TOOL COMPANY, OF PENNSYLVANIA.

PN EUMATIC HAMMER.

SPECIFICATION forming part of Letters Patent No. 647,416, dated April 10, 1900. Application filed December 2l, 1899. Serial No. '741,120l. (No model.)

T0 all whom t Vmay concern: vBe it known that I, JULIUs KELLER, a citi- Zen of the United States, residing in the city and county of Philadelphia, State of Pennsyl- Vania, have invented a newand useful Improvement in Pneumatic Rammers, which improvement is fully set forth in the following specification and accompanying drawings.

My invention relates tov an improved construction of a pneumatic rammer or tamping machine; and itl-consists of a novel construction of auxiliary valve, a case therefor,V a valve-box, main valve, and its. adjuncts, whereby said main valve is caused to shift at the proper intervals, and thus regulate the How of the motive fluid.

It also consists of a novel construction of hollow feed-screw or feeding device, which is secured to the cylinder-head and serves to conduct the motive iiuid directly into the internal chamber of the valve.

It also consists of a novel construction of universal joint common to said feed-screw or.

feeding device and the su pply-hose, whereby the tool can Vbe raised or lowered, according" invention, certain of the parts being shown in elevation. Fig. 2 :represents a longitudinal sectional view `of the valve-box, auxiliaryvalve case, cylinder, and their adjuncts on an enlarged scale. Fig. 3 represents a longitudinal sectionalview of the hollow feedscrew or feeding device employed to convey1 the motive fluid to the interior of said screw.

Similar numerals of reference indicate corresponding parts in the gures.

Referring to the drawings, 1 designates the cylinder of the rammer, and 2 its nosepiece, through which passes the piston-rod 3, to. which is attached the stainper 4. i

5 designates the piston,'provided with packing or rings 6 and having secured thereto the auxiliary valve 7 by means ofthe plate 8.

9 designates the auxiliary-valve case, ad-

`main exhaust-port 39.

`with the universal joint at the point 18, the

motive fluid passing through the hollow screw or feeding device 13 to the main valve 19.

4When the parts are in the position seen in Fig. 1 or Fig. 2, the piston 5 is near the end of its stroke. The auxiliary valve 7, whose function is to control admission and exhaust of the motive fluid to and from the large Vpressure area of the main valve 19, now opens the port 2O through the reduced neck 21 and releases the pressure fromthe large'pressure area of said main valve through the ports 2O and 22 and exhaust-port 23. The main Valve 19 has moved backward or to the left and the slot 24 in the valve-box 10 is open, communication being now made with the port 25, and

`the motive iiuid passes through said slot 24 and port 25 intothe rear end 0r portion 26 of the piston-chamber and drives the piston forward or to the right until Athe reduced neck 27 of the auxiliary valve 7 connects the ports 28 and 29. The port 30 is always open for `live motive fluid, which now passes through the ports 30, 29, and 28 to the large pressure area of the main valve 19 by means of the passages 22 and 31 and drives said main valve forward or to the right, thus closing the slot 24 and opening port 32. The motive iiuid can now ow through the port 32 and ports 33 and 34 and, entering the` front end 35 of the piston-chamber, drives the piston back `or to the left. y `its forward position, the slot 24 and exhaustport 36 are connected by the reduced neck 37 Vhen the main valve 19 is in of said main valve. Therefore the motive fluid from the back end ofthe piston will exhaust through port 25, slot 24, exhaust-port 36, and When the main valve -19 is in its backward position, as seen in Fig.

Ijacent the upper end of which is the main- Valve box 10, provided with the top 11.

12 designates the cylinder-head, which is IOO l, the ports 36 and 3S are connected by the reduced neck37 of said main valve and exhaust takes place from the ports 40, 34, 33, 38, and 36 to the main exhaust 39.

Thetool can be used without the feed-screw and hangers and held by the operator by the handles 4l. In practice a'throttle-valve (not shown) engages the exhaust-port 39 and by throttling the exhaust the action of the machineis readily controlled. The tool can be easily raised or lowered to suit the work by turning the cylinder l, the feed-screw or hollow feeding device turning in unison therewith in the feed-nutl without disturbing the supply-hose, as the same is connected to the feed-screw by the universal joint 14.

It will be evident'that changes may be made Yby those Yskilled in the art which will come within the scope ot' myinvention, and I do not therefore desire to be limited in every instance to the exact construction I have herein `shown and described.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a pneumatic rammer, the combination of a cylinder having a nosepiece through which the piston passes, a ramm'er connectedto said piston-rod, a piston, an auxiliary valve connected to said piston, an auxiliaryvalve case located Within said cylinder and having ports therein adapted to aline with the necks of said auxiliary valve, and a main valve for controlling the movement of said piston, said main valve being actuated by the passage of fluid through said ports.

2; The combination of a cylinder, a piston therein,an auxiliary valve,an auxiliary-valverod case Within said cylinder, a valve-box adjacent said case, a top on said box, amain valve in said box, a cylinder-head having an inlet for the motive fluid and discharging into the interior of said main valve, the latter being controlled by the movements of said auxiliary valve. 3. Apneumatic rammer, consisting of a cylinder, a cylinder-head therefor, a piston, an auxiliary valve, an auxiliary-valve case having ports therein, avalve-box, a main valve contained in said box, a cap for said valvebox,.a feed-screw secured in said cylinderhead and a feed-nut through which said screw passes.

4f. The combination of a cylinder, a cylinder-head therefor, a feed-screw secured to said head and passing through a feed-nut, hangers attached to the latter, a hanger-bolt engaging the extremity of said hangers, a passage extending longitudinally through said feed-screw, and a universal joint for said feed-screw having a hose attached thereto.

5. In a pneumatic rammer, a cylinder, a piston, an auxiliary valve connected to said piston and provided with necks, exhaustports controlled by said necks, an auxiliary-` valve casing located in said cylinder and containing said ports, a main valve having different pressure areas and always exposed to fluid-pressure and ports for conducting live motive fluid to and from said piston.

6. A pneumatic rammer having a piston, an auxiliary valve connected thereto and provided with reduced necks, exhaust-ports controlledl by said necks, a main valve having different pressure areas, and always exposed to fluid pressure, port's controlled by said main valve for admitting live motive fluid to either side of said piston, and exhaust-ports also controlled by said main val ve for permitting the exhaust of the motive fluid past said valve to the atmosphere.

7. In a pneumatic rammer, a cylinder, an auxiliary valve, an auxiliary-valve casing, a piston', a piston-rod connected-therewith and carrying a rammer,'said auxiliary valve being connected to said piston and having a plurality of necks and exhaust-ports in said casing controlled by said necks in combination with a main valve for controllingthe movement of said piston, said main valve being controlled by said auxiliary valve.

S. In a pneumatic rammer, a cylinder, an auxiliary-valve casing having ports therein, a piston,a piston-rod connected therewith and carrying a rammer, an auxiliary valve located in said casing and connected to said piston and having a plurality of necks adapted to aline with said ports for enabling the exhaust to be controlled, and a main valve, in combination With ports controlled by said main valve for admitting the fluid to said piston, said main valve being controlled by the auxiliary valve.

9. In a pneumatic rammer, a cylinder, a cylinder-head therefor, a hollowT feed-screw engagingsaid head, a su pply-hose, and a universal coupling com m on to said hose and feedscrew.l

l0. In a pneumatic rammer, a cylinder, a

cylinder-head, a hollow feed-screw engaging.

said head, a feed-nut in which said screw is rotatably mounted, hangers engaging said nut and means for enabling said cylinder and hanger to be suspended from the desired point. c

l1. In a pneumatic rammer, a cylinder, a valve therein, a cylinder-head, a piston having an auxiliary valve provided with reduced necks, a piston-rod carrying a rammer, a hollow feed-screw engaging said head, a feednut in which said screw is mounted, hangers secured to said nut, and a bolt joining the outer extremities of said hangers.

l2. In a pneumatic rammer, a cylinder, a

valve therein, a cylinder-head, a piston having an auxiliary valve connected thereto and provided with reduced necks, a piston-rod carrying a rammer, a hollovtr feed-screw engaging said head, a feed-nut in which said screw is mounted, hangers secured to said nut, and a bolt joining the outer extremities of said hangers, in combination with a supply-hose and a universal coupling common to said hose and feed-screw.

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13. The combination of a pneumatic rainmer, a hollow feed-screw for supplying motive fluid thereto, a suppl y-hose, and a coupling common to said hose and feed-screw.

let. The combination of a pneumatic ramlner, and a hollow feed-screw for supplying motive fluid thereto.

15. The combination of a pneumatic ramlner, a hollow feeding device for supplying motive lluid thereto, a feed-nut suitably supported, a supply-hose, and a universal coupling common to said hose and feeding device.

16. The combination of a pneumatic rammer, a hollow feed-screw for supplying motive uid thereto and suspension devices for said feed-screw.

17. The combination of a pneumatic rammer, a hollow feed-screw for supplying motive fluid thereto, suspension devices for said feed-screw, a supply-hose and a universal coupling common to said hose and screw.

1S. In a pneumatic rammer, a cylinder, a piston therein, a nosepiece, a piston-rod con- Anectcd to said piston passing through said nosepiece, a valve for controlling ports common thereto and to said piston, said valve consisting of a hollow shell or cylinder, the interior surface thereof being always open to fluid-pressure, said valve being located extcriorly to said piston, and means for enabling said valve to control the movements of said piston.

19. In a pneumatic rammel', a cylinder, a piston therein, a nosepiece, a piston rod passing through said nosepiece and having a rammer thereon, a main valve for controlling ports common thereto and to said piston, said main valve consisting of a hollow shell or cylinder, the interior surface thereof being always open to fluid pressure, an auxiliary valve having necks thereon, an auxiliaryvalve case, and -ports in said case coacting with said necks and auxiliary valve, said auxiliary valve controlling said main valve.

20. In a pneumatic rammer, a` cylinder, a piston therein, a nosepiece, a piston-rod passing through said nosepiece and having a rammer thereon, a main valve for controlling ports common thereto and to said piston, opposing pressure areas upon said valve against which the motive fluid acts to shift the valve in opposite directions, an auxiliary valve having necks thereon, an auxiliary valve case, and ports in said case coacting with said necks and auxiliary valve, said auxiliary valve controlling said main valve.

2l. In a pneumatic rammer, a cylinder, a nosepiece therefor, a piston, a piston-rod projecting through said nosepiece and carrying a rammer, an auxiliary valve case within said cylinder, an auxiliary valve located in said case, and a main valve adapted to coact with ports in said cylinder and auxiliaryvalve case, said auxiliary valve controlling said main valve.

22. In a pneumatic rammer, a cylinder, a nosepiece therefor, a piston, a piston-rod projecting through said nosepiece and carrying a rammel', an auxiliary-valve case within said cylinder, an auxiliary valve located in said case and having necks thereon, and a main valve adapted to coactwith ports in said cylinder and auxiliary-valve case.

23. In a pneumatic rammer, a cylinder, a

piston therein, an auxiliary valve attached to said piston, an auxiliary-valve case within said cylinder, and a main valve adapted to coact with ports in said cylinder and auxiliaryvalve case.

, 24. In a pneumatic rammer, a cylinder, a piston therein, an `auxiliary valve attached to said piston and having necks thereon, an auxiliary-valve case within said cylinder,and a main valve adapted to coact with ports in said cylinder and auxiliary-valve case.

25. In a pneumatic rammer, a cylinder, a nosepiece therefor, a piston, a piston-rod connected to said piston and projecting through said nosepiece,an auxiliary-valve case within said cylinder, an auxiliary valve located in said case, a main valve consisting of a hollow shell whose interior surface is always open to Huid-pressure, said main valve being located exteriorly to said piston, and means for enabling said main valve to control the movements of said piston.

26. In a pneumatic rammel', a cylinder, a nosepiece therefor, a piston, a piston-rod projecting through said nosepiece, an auxiliaryvalve case Within said cylinder, an auxiliary valve located in said case and having necks thereon, a main valve consisting of a hollow shell whose interior surface is always open to fluid-pressure, said main valve being located exteriorly to said piston, and means for enabling said main valve to control the movements of said piston.

' 27. In a pneumatic rammer, a cylinder, a piston therein, a main valve, a valve-rod case in said cylinder intermediate said piston and main valve, and an auxiliary valve connected to said piston and mounted in said auxiliaryvalve case, said auxiliary valve controlling the movement of said main valve and the latter being adapted to coact with ports in said cylinder, and auxiliary-valve case.

JULIUS KELLER.

Witnesses:

WM. GANER WIEDERSHEIM, C. D. MCVAY.

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